A kind of multi-core DC submarine cable and its production method

Abstract

The invention provides a multi-core DC submarine cable, which includes two electric units with the same polarity, additional electric unit components, several filling strips, tapes, cushions, armor layers, outer sheaths, and additional electric unit components. The outer diameter of the section is the same as that of the polarized electric unit; the two polarized electric units are twisted together with the additional electric unit components, and the outside is wrapped in sequence with tape, cushion, armor layer, and outer sheath; the two poles A number of filling strips are arranged in the gap between the electrical unit, the additional electrical unit assembly and the tape. The multi-core DC submarine cable is beneficial to save laying costs and laying time, and can effectively solve the roundness problem of electric units with different outer diameters. The present invention also provides a production method of the multi-core direct current submarine cable, in which the two polarity electric units and the additional electric unit components are stranded in the vertical direction by gravity, and the multi-core direct current submarine cable is stably and efficiently stranded.

Description

technical field [0001] The invention relates to the technical field of submarine cables, and more precisely relates to a multi-core DC submarine cable and a production method thereof. Background technique [0002] The DC submarine cable is suitable for connecting the converter equipment at both ends of the DC transmission system. It is equipped with submarine cable accessories to build a complete underwater or land transmission line system. It often serves large-capacity and long-distance transmission projects and requires a large conductor cross-section. Therefore, Most DC submarine cables in the prior art adopt a single-core submarine cable structure design. The submarine cable in the prior art adopts a single-core structure with a large cross-section, resulting in high engineering cost, long cycle time, and high overall cost. In addition, the single-core DC submarine cable needs to fill the optical unit in the armor layer when compounding the optical fiber, or add the fi...

AI Technical Summary

Problems solved by technology

However, there is no successful experience and case for three single-core DC submarine cables

In addition, the bundling laying scheme has high requirements on the construction ship, which requires a special multi-rotary construction ship and completes the transformation and upgrading of auxiliary equipment, which requires high investment and is not conducive to large-scale advancement

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